RE: Directory Harvest Attack

  • From: "John Tolmachoff \(Lists\)" <johnlist@xxxxxxxxxxxxxxxxxxx>
  • To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 6 Dec 2004 10:18:02 -0800

Welcome to that latest chapter in the war on spam. What you are seeing are
connections from zombie computers. These are computers that are infected
with viruses. The primary purpose of some of the newer virus is to create
zombie computers which are then used for distributed spam ?attacks.?


The best way to fight this is to use a gateway or front end to your Exchange
that is user aware.


John Tolmachoff


eServices For You


-----Original Message-----
From: Tiago de Aviz [mailto:Tiago@xxxxxxxxxxxxxxx] 
Sent: Monday, December 06, 2004 5:56 AM
To: [ExchangeList]
Subject: [exchangelist] Directory Harvest Attack

Hello All,


I?ve been suffering a DHA for the last two weeks. Nothing major, just a
couple of e-mails per minute, but it is clogging my spam box with all kinds
of invalid addresses.


I?ve disabled NDR´s so the dude who?s sending these things won?t be able to
know which e-mails are valid or not.


I´ve tracked these messages and they appear to be coming from all over the
place. How can I fight it? Disabling NDR´s is not a cool solution because
people can´t know if a message was delivered here.


Thanks in advance,



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